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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |
Balance Beginning | $ 779.3 | $ 778.7
Change in goodwill relating to [Abstract] |  |
Acquisition of Sivomatic | 35.0 |
Foreign exchange translation | (1.9) | 0.6
Total | 33.1 | 0.6
Balance Ending | $ 812.4 | 779.3
Finite-Lived Intangible Assets [Abstract] |  |
Weighted average useful life | 32 years |
Gross carrying amount | $ 255.9 | 229.5
Accumulated amortization | 41.8 | 33.0
Performance Materials [Member] |  |
Goodwill [Roll Forward] |  |
Balance Beginning | 720.9 | 720.9
Change in goodwill relating to [Abstract] |  |
Acquisition of Sivomatic | 35.0 |
Foreign exchange translation | 0.0 | 0.0
Total | 35.0 | 0.0
Balance Ending | 755.9 | 720.9
Specialty Minerals [Member] |  |
Goodwill [Roll Forward] |  |
Balance Beginning | 12.7 | 12.1
Change in goodwill relating to [Abstract] |  |
Acquisition of Sivomatic | 0.0 |
Foreign exchange translation | (0.4) | 0.6
Total | (0.4) | 0.6
Balance Ending | 12.3 | 12.7
Refractories [Member] |  |
Goodwill [Roll Forward] |  |
Balance Beginning | 45.7 | 45.7
Change in goodwill relating to [Abstract] |  |
Acquisition of Sivomatic | 0.0 |
Foreign exchange translation | (1.5) | 0.0
Total | (1.5) | 0.0
Balance Ending | $ 44.2 | 45.7
Trade Names [Member] |  |
Finite-Lived Intangible Assets [Abstract] |  |
Weighted average useful life | 35 years |
Gross carrying amount | $ 204.2 | 199.8
Accumulated amortization | $ 26.6 | 20.7
Technology [Member] |  |
Finite-Lived Intangible Assets [Abstract] |  |
Weighted average useful life | 13 years |
Gross carrying amount | $ 18.8 | 18.8
Accumulated amortization | $ 6.4 | 4.8
Patents [Member] |  |
Finite-Lived Intangible Assets [Abstract] |  |
Weighted average useful life | 19 years |
Gross carrying amount | $ 6.4 | 6.4
Accumulated amortization | $ 5.6 | 5.3
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Abstract] |  |
Weighted average useful life | 22 years |
Gross carrying amount | $ 26.5 | 4.5
Accumulated amortization | $ 3.2 | $ 2.2

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